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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ecfa47d57ed00d841b2093015512e38118372d6efc84abc28b2803a018c8f93' 
  AND token = 'wuTcoPfuwj95BHtRUkZ0d6wErBIuaaOmaWzMinxzJC0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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