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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa228c517fac1e9fd624efcbed18a15c0d763cbc74f51a6d2e50f23e6bd77fa4' 
  AND token = 'smwPZibTAfHWYkl2h8zTSrpbK54kgQJX3OABR3JiInE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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