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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9d570bad2f7a34ce9ef57533df5ee216d2ebe046fa8b44a7b736d9609481031' 
  AND token = 'gUlkiveh/llR3yGMnPi2XDR33Hd6jfqfaeuI8YBNb3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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