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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb029f3c343ae1c69062eccb1d881691756dbcb07f57ad441ee2bfcc42eb4744' 
  AND token = 'jFZg1mf4XBvTesyrE8ZkOXIklfeRSE9gl+ZGHOM9mkw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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