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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83b33b037189a7eb52e6860c54e634c81504432f47a593e2390e090189a59ea2' 
  AND token = 'L13Fp9PhKMa4/TqKM8UHCej1y2LHHHo4fZyKu0nmuf8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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