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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '639a80cd8ba8e2b94f19552693bca827eb05959f254486b969cc557b3447e36e' 
  AND token = 'CHe3OGukajF5AWN3fJFdaF2r61UtvbBzdjUJkLKCfAs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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