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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc8c7d7398c95338f85a5b0b388ffb0b058ca2c9c76ade5cdc475be0ea8ed20d' 
  AND token = 'cv+cYyJ+wzTp3bF0+PKAunzEMEuXbbFB+UZ480fIbZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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