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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59f4dd6bd06c6459a0046792741af666ace030a80ad038501c7b9ea60f5184af' 
  AND token = 'KXLzGhJbrCH9svBDPQH+htl7Ckxp9fQ96ECl5s/e0Ns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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