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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc9b091740ce0e540082075a5bd4b37cb273507ab1a8fec8895b021cf8f9953b' 
  AND token = 'Do7DT5s6X9bMgYFV2LUgymkf4ChCM3Zlnu7eJ1EgKyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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