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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a03f1c775378c6d95a8e218db34867ed128d0bc9df4cc2b7fe393d6fb734a79' 
  AND token = 'mRyWbli6CmPtMppUatCloVf1iplugADZwGA38pxuJo8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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