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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfad9e929d1223fdcd32d8d577397ac9c8f014edd8da320b2b0f972c710ccd41' 
  AND token = 'oFD9VdkgyMt6wbIntPp48NlH7yi6zAZD34fiOI8/UEY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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