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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a3f3c6f91484f523e82ed55d5b89f9b372559b77c83a16982b82df0ef1d864c' 
  AND token = 'jg2AVUZJf61d9NYHYXJEHnrQhB6U7RgF2h4e0SgT7RA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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