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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20dcc4a23886897a5f2a20265e9edc169b911d62a4efa045b9e392d06da042a2' 
  AND token = 'Xg4iYFrgJEWeO6ENSBZ/G3U7qParT+khhARs97oPEPo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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