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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '633e66e923392499cf5f1278bcf8c507b0ec012a0dba22b6e9af43a0cbf30075' 
  AND token = 'GTtVof/JtZboxhR9naC+3SwSahLOryoeCpTs2Ll2U0w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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