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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc324e5b2aa03a8e6cf58d283803e08bb828b9b10785463cf62257e673f53c2a' 
  AND token = 'P9ZnvMEoMQFhHMgZKgaZ3hkp9LiKh+NiuagdMi65DX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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