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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbd58276956aac4cfcf9493ff5cee17218d7316f1f3776b92794762d57985253' 
  AND token = 'Djzh8Lv5UP067oKAioI86NWzmQ4gkmzXkXtyhpC3FQA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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