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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f666041f7ff246e2833d8fe71ccee4a3d3f34fe30c3459f77a54ea284933362' 
  AND token = 'Mq2fGErmIpmQSYmnlg/Q8NFnTTGo7fR4bZjmwL4mgfc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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