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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a982310ea55732f4b0ded5cfbdb5e5516f76edcf7f96ce459b47d8f213e90602' 
  AND token = 'pCTaq5DcZc9Wtvzm6hU5JdG9r9zKZR6cfaVgYm5avg0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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