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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c717aa5dd25ee3378bbb867792a9c8cf5407aab9fccc3df52732ef2ef445c2e' 
  AND token = '5f1gNQnT5tp0XmfJ5bpgdn5B0h6sDwM+VPKfIMn4pdU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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