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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a9b6978134542c5cb4d5017f891a38aa003dc62499be0e8fe5434a1cff7804a' 
  AND token = '9Eo4E64nIH58Lm6wwv7Fjh7pyPT5FkCPgWHakAMdb6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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