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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd503e1a916f59db13fe7e02a5e583e4ff8a8d757e8bf69849afbeea28bfd6c4f' 
  AND token = 'xtQAnpGJFlErNZc1Ad9pWjxGOGgqNGXQKxKyW7mm49k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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