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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be1f2ff4f304694eab8f0b4fa23cbaac49f8e8349669cd09934ab0e9e8d01403' 
  AND token = 'QjevIg5icc8vuwjGELdiEPpupjDAbOJi11o5iOuCg98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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