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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5cbb940065ff284633339137dbe3a471c86e6628f1a9154dc2d791d977ae66e' 
  AND token = 'XIi2117ZbQ1AtCOoX3xXGD16RYtj3siDZsvsxuOVQJk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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