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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b3dcf9253dba66d251407ff2471b69c3d2d08f7e0ba4202b1fc798974f757b3' 
  AND token = 'Z64rZLvmNMsjG1xO0yZm249pE2p/F3m2kfNuuH8aZjw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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