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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98df2c68b363694dcfb2b9ea19744aae28f409d9d61894765df52f14c910184d' 
  AND token = 'yuhTXMUJ0ZDMhHcJmKdWbW6oKrlU4K6e2Fx+WCpFsuA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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