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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a4356654ec5e639a2bfb62323dc7c7ad8c6c70bcaf0c7d4f31cc535e8048fe0' 
  AND token = '2fWXhflvs4KSEy9Zeo/gPQcv3NGRpsz6cSvmLvPsXjI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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