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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3adb926f805335003dbb62a3dc5b752e6bf14bc3a5dd639e9040a24302087fea' 
  AND token = 'X4GogVPQ55f3i9hHByF4ghJ/sFFtMpkeF/g7B641C8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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