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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2006ca503400f74aef8247174db64ee09e9de1b21a678715ab522b148e283df0' 
  AND token = 'IwElccqeTv8KK9FwZp74bvdoabyrYcLQ3BDglEncUjw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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