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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf2d95c90eb59fc61ad97c40da9a4559b1d3831d84134a2136190e907175ad4a' 
  AND token = 'UbzoUTwdm5DY0h5cHmbH1y5O2MbyHr/ftcQya2Xno/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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