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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08ea7342a459c9d707151810bd2c8a68b8acc034d9b3137e46053538e3464a63' 
  AND token = '98Q4Hw1HhoK7mJyGmWmMwR7tLFjYpBbr8Gu8Q6opYno=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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