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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68d1331d17bd742e016263e77900381873eea34011fc626293c460da032e05c7' 
  AND token = '/zxWchICQ5jU5bfi26HjKO2CxIADXZWQNQXJbE88XlI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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