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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fce016c679f62b7fcda5b908e13b16e31e1374be29c2348fd64b9638531803d2' 
  AND token = 'KS9vxJBkc2MfVAgjZdT3DKF9fUZVc9C9zhFpluf5Ry8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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