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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16e07e73905806afcc343e846b5453e69e574ef9234536c7ef2c81ee50e7152d' 
  AND token = 'T0J4mUFnMBGA8XPDsqo3qxiN1fHVpk83sv1ESW0boac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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