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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9029c68ea9114607bf3102781fc71485d9f462bc2b5134ba2596c395132277e0' 
  AND token = 'XwNL58O7LGUmmcR7PO4mWRR20DhTjXSLo+zY2sAh8S4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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