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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32f47c904341722e61ed168fc7f9661a029c386f545cba28ec5cd62cb0628a32' 
  AND token = 'NRt8/HJNNSWwXnD8XlmrWmeBCTxu63ae7749csscx3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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