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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f225031756ea6e074ac56d5c3295331130961b6bb29a6144b1b339623c4e4ef2' 
  AND token = '9wgX0S9mT8Qno3OiqKxQnpDE/k3nCuNL+VljGbKZDgc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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