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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '619a24f40b5d4fd1a2d717abe341586ee1d9678fcebc9c8f2054887970e29ee5' 
  AND token = 'wJ2I1EK+Jhg1zJtV0R7FkpvY11/04Iryug/LSfxluIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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