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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2044213acad2d1a6170569f8e32b665fd05153ac8f84e870634d974202ef3ffd' 
  AND token = 'iZf1xXG7WH2Fi46oBFKzV+eBmK6nEVp8lOehFuokkFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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