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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '398051f39a42a40ebba8b4ddca65b07ff089093d9820e79ffdb6e75dab5937de' 
  AND token = 'F15ukY7oRfMZhEKN+oms/8OiF1J69BvgLAVBMABis5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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