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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c69ca4ec45f174bf4a4d6c9f14f4069130df8f9116d3a34a01fd87fd4f334e6' 
  AND token = 'gaGkyVJ1aBMYKcxnYAgL/YjAYzI5FtvIjAtrE+WLWlI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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