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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5c1d76a5cd3696cf5e2865652466a78e5c699146c10de225dfb58e9f915a167' 
  AND token = 'C3KjIkhclKMgFDUUWnlJwhwIT1wwAblHtV463FJOt8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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