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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da86e67ecb72fac39d206df89fe7abf1ecf8eeaea7481218a5e7c48d026a9bcc' 
  AND token = 'Vu/9zc2to8xoj2Mi8mwZh2cCHVGKwNB4JZQbcSu3mvM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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