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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df74eb5a2ceab495eac04cc0128b684dea6bd685e6948f40a7f3d077647ac948' 
  AND token = 'jFZ1mnPO9UvtuaueeisfToJU+spuQrur5rRLvA13YYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}