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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8684eabe3c15341c0f66150fb90b8fd5eb8c1d7f97a5e4f708a6157e1a84ac0' 
  AND token = '+L5ulD6YPg6fOwIt7RFj/P+mo7D1fwLvIaPrWyeHy04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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