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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89a6f8c96b6243674fc1d30db4aa3f26264622b8496aad9dbebe2d59088c29cf' 
  AND token = '8hC9fsb+9hH+yA5tBIhAxmUU1DFCJHo364wMtdiyH+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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