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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15b8df559089203d93e1252b9192601b5376cb354f703e08143e366780d519d5' 
  AND token = 'F19FfqZBZc1z9zkptSTRSY0KYHja9wKZ5AUGIVXlUS8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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