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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2965584925c019379cd55f35dc3022110efb43b13718a5fc0778e80886e95025' 
  AND token = 'fHhepN8Ta1wVF/cY6DzIT7AloNs3Ah3prQBJ8nUmZ9I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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