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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dee05af0e6ff242b273f7d4d1067e9ab8c2c6b126eb7890a286fdd789e77064e' 
  AND token = '9IMManFXOkQ27KQfAUQ4w/FUrXPUY4dY00WFkE5xecc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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