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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39a8b1886e34a10b12eca4ce1ae6b3ca85531aef0bb1325f703a24ae5fcadba2' 
  AND token = 'ARE9ILathD/eiGIepAA8fxqnNZofVkZvqN5TEpyOo8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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