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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '567074a6e0e69b1b8094da968e96e18eda9376351993026cb3587d476cdb00a8' 
  AND token = 'QHW34kwBXvmfYkF5MsuY4ca0VB46+VZFMc6ZyQO0s0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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