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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62ed0ff1c18c53bb1c1691c4acefb103505f81b2ff0c6de485897c02df8e5898' 
  AND token = 'pi6gyTPrZw27p3jGa/ljasfjjZK4s6YQayzz5P9BhE4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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