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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70ef24aa7c71d4ec428553722b9c9ec20de53804d99731eceea240a4987d607e' 
  AND token = '8bQZ9VOxSbIv0XpvCMUC/5NogyMD2K1nS1t1cJISTsg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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