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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dec52a0eed69d84b51f10ab113027bd377ddc008a44fb5cc49009806aa61497b' 
  AND token = 'og0dHLfL7mGiku8g6BCDD3iDYJ6u4ZBiR8X9NmDR3Dg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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