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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '899ee709f9709b038f05d9b1e385d9372867d258eb68fdd946cffa603ab0d5a3' 
  AND token = '6PWnJv8CdnrWeEm3pjbGUyAHAoOBzRfXzqyxlyw6u3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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