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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38fd89d9c0b51969adfc5e25efdfe690dd37ba3a6d3ca200f5857c4f3b05b929' 
  AND token = 'Qc0s7aWmWXWstZ4VyPbNlyRh74tBm9Hhr3WZVZOLzXQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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