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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8acaf9544f37578579054412e76a51f3a516c9fef824458fb560528aca408c7f' 
  AND token = 'AU4Aml/X2JnH5C+nDmE3cA7wbT21b17yqGXj36CnZUI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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