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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28699c23163e3ab06496311f96d534afd6f47eefa01d079f94939ba9a0a8fa89' 
  AND token = 'FeUVi+N1RnwwVwLlMQEUspS2lxqHZeSnUQRXx6zqCFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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