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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94c9ef183c68e310fd94f89557f4f39cc1374f5048fc370234a24cf963418e2f' 
  AND token = 'rOD0oKSpxTRLcg6pIrpJi6rAXO/ksoE1Cczlu2RNzN8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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