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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a41dd87c85e6abf6d7a766460f51eb95480f8603023b7553589294009e1fd4b' 
  AND token = 'pTaB2KiFzigx9+/7P+gGyXNtRc4o3JjS3s6i/OdcQ9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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