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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '038dee2ba723ef8768bd4d901a1e48fffd4d33c463b34a057502ad933d1d72da' 
  AND token = 'V5u5YhlZEFO3nqaR0XYeB8sQuHFJnt0MKeabk83WOqY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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