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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01abfea42769f56252ad7698fb4bb44192feb010ff83d305ff3c6062ebfba5d4' 
  AND token = 'xNdliPdNv6y59QAtZA6hjdYZm5KZpmlWaV951aw7P7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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