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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad8f31c0b270b540538c8a88f4e736f60578e3771c9ef889552ad47edf823a12' 
  AND token = 'GvDxZ8vNUD3OfG5pOk8il9RkwpbIKnJ5qIirWXLTikA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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