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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1aa307aa0bbc2d023e5939c8365efec29f8b721bb57b02b0fd31f12042ec2bb' 
  AND token = 'iUjEuInNGMIZA4x094zGruaaB0aDlYYQnCt7Azhcr+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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