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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e2d197caf7216ab5e0702d0670668ab6baed44616a0f036f1a9916e2f2ccc81' 
  AND token = 'TuyjoH5iP+CxBwj/hge+TfQleT5XQl81RwH2qkTnSys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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